Telephone instrument



FIG. 1 is a left side, top and front perspective view of a telephone instrument showing our new design;

FIGS. 2 and 3 are respectively front and rear elevational views thereof;

FIG. 4 is a left side elevational view thereof; and

FIG. 5 is a top plan view thereof.

The broken line showing of rectangular panel and pushbutton keys in FIGS. 1, 2 and 5 is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a telephone instrument, as shown and described. 